System used to feed wc flushing tanks with recycled water

ABSTRACT

The present invention relates to a system used to feed WC flushing tanks (C) with recycled water collected in a tank ( 1 ) in which the water coming from the sink (L), other sanitary fittings and household appliances (LB) is drained; it being provided that, in case of absence or draining of the recycled water reserve, the same system is capable of favouring the feeding of the flushing tanks (C) with “clear” water normally supplied by the domestic water network ( 8 ).

The present patent application relates to a system used to feed WC flushing tanks with recycled water.

In a time when water resources are scarce, more and more attention is paid to situations that originate water waste or excessive consumption.

It has been ascertained that water domestic consumption is heavily determined by the water used for WC flushing tanks.

In view of the above, attempts have been made to find a way to save on this specific water consumption and recycle water that has been previously used for other domestic uses.

Nevertheless, it must be noted that solutions have always proved to be complicated and not very functional, as shown by the fact that they have had no practical diffusion.

The specific purpose of the present invention is to devise an effective versatile system that can be installed in any room-bathroom, including pre-existing ones.

As a matter of fact, the system of the invention is finally able to recycle the water that has been previously used in the sink, other sanitary fittings (such as the bathtub) and also in household appliances installed in the same room-bathroom (such as a washing machine) and use it in the WC flushing tank.

Another purpose of the invention is to give the system a simple inexpensive structure, composed of a few “dedicated” parts designed to operate in coordination with the sanitary fittings and the branch line of the domestic water network installed in the room-bathroom in a simple, practical and inexpensive way.

The idea on which the present invention is based is to provide a recovery tank, preferably positioned under the sink, designed to receive the water previously used in the sink, in other sanitary fittings and in the washing machine installed in the same room.

The recovery tank must be connected by means of an ordinary supply pipe, with the branch of the domestic water network that feeds the traditional WC flushing tank.

Through a series of suitable valves and sensors (that will be illustrated in detail below) and thanks to the management and control activity of an electronic control unit, the water collected in the recovery tank is conveyed towards the WC flushing tank every time the tank is flushed.

During the various use cycles of the recycled water, until a suitable water reserve is available, the system of the invention will automatically interrupt the supply of “clean” water brought by the said branch of the domestic water network that is normally connected to the WC flushing tank.

Because of the system of the invention, the WC flushing tank is reloaded—until it is possible—with the water that has been already used in the sanitary fittings or washing machine, without having to get water from the domestic network, thus considerably limiting the use of water resources.

Obviously, the inevitable presence of soap or detergent in the recycled water is not a contra-indication against use; on the contrary, the presence of the soap/detergent produces positive effects since it contributes to increase the WC hygienic level.

Finally, it must be noted that the system of the invention is also capable to automatically remedy the possible absence of water inside the recovery tank.

In such a case, the system will fill the WC flushing tank with the “clear” water normally provided by the domestic water network, at least until the recovery tank is not filled again.

For purposes of clarity the description of the present invention continues with reference to the enclosed drawing, which is intended for purposes of illustration only and not in a limiting sense, wherein FIG. 1 is a diagrammatic drawing of the system of the invention installed in a typical room-bathroom.

As mentioned above, the system of the invention comprises a recovery tank (1) that, in the constructive embodiment shown in FIG. 1, is designed to receive the water already used in the sink (L) and in the washing machine (LB).

In particular, the water coming from the sink (L) and the washing machine (LB) is poured into the tank (1) by means of corresponding delivery pipes (2, 3), while the possible water excess inside the tank (1) is eliminated by means of an “overflow” valve provided on top of the tank and connected to the sewage by means of an outflow pipe (4).

The tank (1) is also provided with a pump (5) that draws approximately at the height of the bottom wall and with a float-switch (6) designed to detect the level of the water contained in the tank (1).

The pump (5) is designed to feed, with the water contained in the tank (1), a pipe (7) that is inserted, at the opposite end, into a branch (8) of the domestic water network.

In particular, it is the branch (8) that is inserted into the flushing tank (C) of the WC (W), with the interposition of a traditional inlet valve (9 a) that is traditionally controlled by a float (9).

Additional parts of the system of the invention are a feed check valve (7 a) mounted along the pipe (7) situated between the recovery tank (1) and the branch (8) of the domestic water network, a flow sensor (11) mounted in the section of the branch comprised between the insertion point (P) of the pipe (7) and the flushing tank (C), and a normally open electrovalve mounted along the branch (8) upstream the insertion point (P) of the pipe (7).

The operation of the entire system is automatically controlled by an electronic control unit (10) that is suitably interfaced with the aforementioned parts, as illustrated in detail below.

To that end, the operation cycle of the system of the invention starts every time the water contained in the flushing tank (C) is flushed towards the WC (W).

In particular, the emptying of the flushing tank (C) is detected by the flow sensor (11) when the sensor (11) detects that “clear” water has resumed flowing along the branch (8) following to the opening of the valve (9 a).

This information acquired by the flow sensor (11) is transmitted to the control unit (10), which is responsible for the entire operation of the system of the invention.

At the same time, the control unit (10) also receives from the float-switch (6) of the recovery tank (1) the information about the possible presence of water inside the recovery tank (1) and, in case of the presence of water, it immediately activates the operation of the pump (5) and the closing of the electrovalve (8 a).

In this way the recycled water contained in the tank (1) is conveyed into the pipe (7), crossing the feed check valve (7 a) to reach the branch (8) of the water network, through which it is finally conveyed inside the flushing tank (C).

It is important to note that for the entire duration of a similar operation phase, the electrovalve (8 a) mounted along the branch (8) of the water network is induced to remain closed in such a way that the “clear” water coming from the network cannot flow towards the flushing tank (C).

The control unit (10) sends the pump (5) a stop control as soon as the recycled water coming from the tank (1) has completed the filling of the flushing tank (C).

The information about the said filling is transmitted to the control unit (10) by the flow sensor (11), which immediately detects the stop of the recycled water flow inside the pipe (7) that is produced as soon as the float (9) of the flushing tank (C) has closed the inlet valve (9 a) once the filling has been completed.

As mentioned above, the system of the invention is able to fill the flushing tank (C) also in the case in which the recovery tank (1) is empty.

As a matter of fact, as soon as it receives from the float-switch (6) of the tank (1) the information about the draining of the recycled water reserve, the control unit (10) omits to actuate the pump (5) and to close the electrovalve (8 a) provided along the branch (8) of the domestic water network.

This guaranteed that the filling of the flushing tank (C) is normally ensured by the “clear” water coming from the branch (8).

In this phase, the presence of the feed check valve (7 a) inserted along the pipe (7) that protrudes from the tank (1) is fundamental.

A similar valve (7 a) prevents the “clear” water brought by the branch (8) from pouring also in the recovery tank (1) in addition to the flushing tank (C).

Nevertheless, as soon as the recovery tank (1) is filled again, the float-switch (6) will send the information to the control unit (10), which will use it in case of a new emptying of the flushing tank (C), activating a new filling cycle of the flushing tank (C) with recycled water.

The system of the invention is also provided with an additional feature for the good filling of the flushing tank (C) of the WC (W).

This feature is actuated in the situation in which the recovery tank (1) contains recycled water, but not in sufficient quantity to guarantee the complete filling of the flushing tank (C).

In this case the initial operation of the system of the invention is normal, meaning that, following to the emptying of the flushing tank (C), the control unit (10) closes the electrovalve (8 a) and simultaneously actuates the pump (5) of the tank (1).

Nevertheless, as soon as the recycled water reserve contained in the tank (1) is finished, before the flushing tank (C) is filled completely, the control unit (10) interrupts the operation of the pump (5) and reopens the electrovalve (8 a) mounted on the branch (8) of the water network.

In this way, “clear” water can be added to the previous recycled water, until the flushing tank (C) is filled completely, closing the inlet valve (9 a).

It must be noted that the operative logic of the control unit (10) is the simple consequence of the information received from the float-switch (6) about the draining of the recycled water in the tank (1); it being provided that, upon receiving a similar piece of information, the control unit (10) reacts stopping the pump (5) and opening the electrovalve (8 a). 

1. System used to feed WC flushing tanks with recycled water, characterised in that it comprises the following parts: a recovery tank (1) of the water coming from the drain pipe (2) of a sink (L) and/or another sanitary fitting, which is internally provided with a pump (5) installed on the bottom wall and with a float-switch (6) used to detect the level of the water contained in it; a pipe (7) provided with a feed check valve (7 a) designed to provide the water connection between the tank (1) and the branch (8) of the domestic water network that feeds the flushing tank (C) usually provided with a water inlet valve (9 a) controlled by a float (9); a flow sensor (11) installed in the section of the system comprised between the flushing tank (C) and the insertion point (P) of the pipe (7) in the branch (8); a normally open electrovalve (8 a) installed along the said branch (8) of the domestic water network upstream the insertion point (P) of the branch (7) from the tank (1); an electronic control unit (10) interfaced with the pump (5) and the float-switch (6) installed in the recovery tank (1), with the flow sensor (11), and with the electrovalve (8 a) inserted in the branch (8) of the domestic water network; it being also provided that the control unit (10) is programmed in such a way to operate alternatively as follows: when the flow sensor (11) detects a water flow in the idle condition of the system of the invention and transmits the information about the emptying of the flushing tank (C) and when the float-switch (6) of the tank (1) transmits the information about the presence of sufficient quantity of recycled water, it closes the electrovalve (8 a) and activates the pump (5), thus favouring the water flow into the pipe (7) and, then, into the branch (8) of the water network and in the flushing tank (C), until the flow sensor (11) signals the stop of the flow following to the closing of the valve (9 a) of the flushing tank (C), usually operated by the float (9) after filling; when, following to the emptying of the flushing tank (C) informed by the flow sensor (11), it has received the information from the float-switch (6) of the tank (1) about the absence of recycled water, it omits to activate the pump (5).
 2. System as claimed in claim 1, characterised in that the control unit (10) is additionally programmed to operate as follows: when during the operation of the pump (5) the float-switch (6) transmits the information about the draining of the recycled water inside the tank (1), it deactivates the pump (5) and opens the electrovalve (8 a) inserted in the branch of the domestic water network (8).
 3. System as claimed in claim 1, characterised in that an additional supply pipe (3) is inserted into the recovery tank (1), which supplies the water drained from one or more household appliances (LB).
 4. System as claimed in claim 1, characterised in that the recovery tank (1) is provided on top with a traditional “overflow” valve that feeds a drain pipe (4) normally inserted into the sewage. 